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Articles 661 - 690 of 2936
Full-Text Articles in Social and Behavioral Sciences
Flexural Testing Of Concrete Filled Fibre Reinforced Polymer Tubes (Cfft) With And Without Internal Fibre Reinforced Polymer (Frp) Reinforcement, Qasim S. Khan, Josiah S. Strong, M Neaz Sheikh, M N. S Hadi
Flexural Testing Of Concrete Filled Fibre Reinforced Polymer Tubes (Cfft) With And Without Internal Fibre Reinforced Polymer (Frp) Reinforcement, Qasim S. Khan, Josiah S. Strong, M Neaz Sheikh, M N. S Hadi
Faculty of Engineering and Information Sciences - Papers: Part A
FRP reinforcement has emerged as an attractive alternate of steel reinforcement due to its higher ultimate tensile strength and weight ratio, and corrosion resistant properties. This study presents the behaviour of Concrete Filled Fibre Reinforced Polymer Tubes (CFFT) with and without longitudinal FRP reinforcing bars under flexural loading. Four circular normal strength CFFT (two carbon FRP tubes and two glass FRP tubes) specimens and a steel reinforced concrete specimen (Reference) of 204 mm and 200 mm diameters respectively were cast and tested. One of the CFFT of each type of CFRP and GFRP CFFT was unreinforced while the other was …
Analytical Model Of Shear Behaviour Of A Fully Grouted Cable Bolt Subjected To Shearing, Xuwei Li, Jan Nemcik, Ali Mirzaghorbanali, Naj Aziz, Haleh Rasekh
Analytical Model Of Shear Behaviour Of A Fully Grouted Cable Bolt Subjected To Shearing, Xuwei Li, Jan Nemcik, Ali Mirzaghorbanali, Naj Aziz, Haleh Rasekh
Faculty of Engineering and Information Sciences - Papers: Part A
A fully grouted cable bolt is normally loaded at rock joints by a combination of the axial and shear forces causing both axial extension and shear deformation of the cable. The proposed analyses presented here attempts to predict the joint shear strength and shear displacement. The analyses are based on the statically indeterminate beam theory and some basic findings and conclusions of other researchers. Parametrical investigation is performed on four influence factors including bolt pretension, joint friction angle, concrete strength and bolt installation angle. Although the true plastic moduli of the cable bolt deflecting section at failure are the essential …
Microstructures And Mechanical Properties Of Dual Phase Steel Produced By Laboratory Simulated Strip Casting, Z P. Xiong, A G. Kostryzhev, N E. Stanford, E V. Pereloma
Microstructures And Mechanical Properties Of Dual Phase Steel Produced By Laboratory Simulated Strip Casting, Z P. Xiong, A G. Kostryzhev, N E. Stanford, E V. Pereloma
Faculty of Engineering and Information Sciences - Papers: Part A
Conventional dual phase (DP) steel (0.08C-0.81Si-1.47Mn-0.03Al wt.%) was manufactured using simulated strip casting schedule in laboratory. The average grain size of prior austenite was 117. ±. 44. μm. The continuous cooling transformation diagram was obtained. The microstructures having polygonal ferrite in the range of 40-90%, martensite with small amount of bainite and Widmanstätten ferrite were observed, leading to an ultimate tensile strength in the range of 461-623. MPa and a corresponding total elongation in the range of 0.31-0.10. All samples exhibited three strain hardening stages. The predominant fracture mode of the studied steel was ductile, with the presence of some …
Assessment Of Optimum Width And Longevity Of A Permeable Reactive Barrier Installed In An Acid Sulfate Soil Terrain, Udeshini Pathirage, Buddhima Indraratna
Assessment Of Optimum Width And Longevity Of A Permeable Reactive Barrier Installed In An Acid Sulfate Soil Terrain, Udeshini Pathirage, Buddhima Indraratna
Faculty of Engineering and Information Sciences - Papers: Part A
Removal of contaminants from groundwater using permeable reactive barriers (PRBs) is a cost-effective and popular engineering solution used throughout the world. Dissolved pollutants in groundwater are removed through geochemical processes that make PRBs effective for different types of contaminants. In achieving this, it is vital to determine the optimum width of the PRB to allow adequate residence time within the barrier and to establish its longevity. For this purpose, both field monitoring and geochemical modelling were conducted for a trial PRB located in the Shoalhaven Floodplain, south of Wollongong in Australia. In this study, the optimum PRB width is evaluated …
Unified Cyclic Stress-Strain Model For Normal And High Strength Concrete Confined With Frp, T Yu, B Zhang, J G. Teng
Unified Cyclic Stress-Strain Model For Normal And High Strength Concrete Confined With Frp, T Yu, B Zhang, J G. Teng
Faculty of Engineering and Information Sciences - Papers: Part A
Fiber reinforced polymer (FRP) has become increasingly popular as a confining material for concrete, both in the strengthening of existing columns where FRP wraps with fibers oriented completely or predominantly in the hoop direction are typically used, and in new construction where filament-wound FRP tubes with fibers oriented at desired angles to the longitudinal axis are typically used. For both types of applications, the stress-strain behavior of FRP-confined concrete under cyclic axial compression needs to be properly understood and modeled for the accurate simulation of such columns under seismic loading. This paper presents an improved cyclic stress-strain model for FRP-confined …
A Decentralized Multiagent-Based Voltage Control For Catastrophic Disturbances In A Power System, Sk. Razibul Islam, Kashem M. Muttaqi, Danny Sutanto
A Decentralized Multiagent-Based Voltage Control For Catastrophic Disturbances In A Power System, Sk. Razibul Islam, Kashem M. Muttaqi, Danny Sutanto
Faculty of Engineering and Information Sciences - Papers: Part A
In this paper, a multiagent-based voltage and reactive power control in the case of a multiple contingency is presented. Incorporating the agent-based autonomous feature to the intelligence of the remote terminal units, the present power system control structure can be used to help in preventing system voltage collapse during catastrophic disturbances. The control algorithm is based on a decentralized architecture of intelligent agents and the determination of a local zone that can carry out quick countermeasures in a decentralized manner as a multiagent system (MAS) during an emergency situation. An adaptive determination of the local zones undergoing voltage collapse has …
A Novel Mobility-Based Routing Protocol For Semi-Predictable Disruption Tolerant Networks, Saeid Iranmanesh, Kwan-Wu Chin
A Novel Mobility-Based Routing Protocol For Semi-Predictable Disruption Tolerant Networks, Saeid Iranmanesh, Kwan-Wu Chin
Faculty of Engineering and Information Sciences - Papers: Part A
This letter considers routing in delay tolerant networks whereby nodes have semi-predictable mobility patterns within a time period. We propose a mobility-based routing protocol (MBRP) where nodes construct a space-time graph dynamically. As the space-time graph may be incomplete, MBRP presents a heuristic that evaluates encountered nodes based on their recorded mobility patterns in order to disseminate a finite number of bundle replicas. Simulation results, over a service quality metric comprising of delivery, delay and overhead, show that MBRP achieves up to 105 % improvement as compared to four well-known routing protocols. Finally, MBRP is capable of achieving 50 % …
A Survey Of Single And Multi-Hop Link Schedulers For Mmwave Wireless Systems, Jian Song, Kwan-Wu Chin
A Survey Of Single And Multi-Hop Link Schedulers For Mmwave Wireless Systems, Jian Song, Kwan-Wu Chin
Faculty of Engineering and Information Sciences - Papers: Part A
Wireless communication at 60. GHz, aka mmWave, provides extremely high data rates, i.e., several Gb/s. Moreover, devices have a much shorter transmission range as compared to those operating in the 2.4 and 5. GHz bands. Indeed, links can be treated as pseudo-wires with minimal interference leakage. As a result, future 60. GHz systems will have very high spatial reuse. This, however, is at the expense of high propagation loss, which can be overcome using directional or smart antennas. Another promising solution is to employ relays to boost the signal of weak links. In particular, if relays are properly selected, they …
Multizone Reproduction Of Speech Soundfields: A Perceptually Weighted Approach, Jacob Donley, Christian H. Ritz
Multizone Reproduction Of Speech Soundfields: A Perceptually Weighted Approach, Jacob Donley, Christian H. Ritz
Faculty of Engineering and Information Sciences - Papers: Part A
In this paper a method for the reproduction of multizone speech soundfields using perceptual weighting criteria is proposed. Psychoacoustic models are used to derive a space-time-frequency weighting function to control leakage of perceptually unimportant energy from the bright zone into the quiet zone. This is combined with a method for regulating the number of basis planewaves used in the reproduction to allow for an efficient implementation using a codebook of predetermined weights based on desired soundfield energy in the zones. The approach is capable of improving the mean squared error for reproduced speech in the bright zone by -10.5 decibels. …
Estimation Of Signal Distortion Using Effective Sampling Density For Light Field-Based Free Viewpoint Video, Hooman Shidanshidi, Farzad Safaei, Wanqing Li
Estimation Of Signal Distortion Using Effective Sampling Density For Light Field-Based Free Viewpoint Video, Hooman Shidanshidi, Farzad Safaei, Wanqing Li
Faculty of Engineering and Information Sciences - Papers: Part A
In a light field-based free viewpoint video (LF-based FVV) system, effective sampling density (ESD) is defined as the number of rays per unit area of the scene that has been acquired and is selected in the rendering process for reconstructing an unknown ray. This paper extends the concept of ESD and shows that ESD is a tractable metric that quantifies the joint impact of the imperfections of LF acquisition and rendering. By deriving and analyzing ESD for the commonly used LF acquisition and rendering methods, it is shown that ESD is an effective indicator determined by system parameters and can …
A Tensor-Based Subspace Wall Clutter Mitigation Method For Through-The-Wall Radar Imaging, Fok Hing Chi Tivive, Abdesselam Bouzerdoum
A Tensor-Based Subspace Wall Clutter Mitigation Method For Through-The-Wall Radar Imaging, Fok Hing Chi Tivive, Abdesselam Bouzerdoum
Faculty of Engineering and Information Sciences - Papers: Part A
In through-the-wall radar imaging, targets behind the wall reflect weak electromagnetic signals that are obscured by the strong returns from exterior wall, rendering the detection and classification of indoor stationary targets very difficult. In this paper, a tensor-based subspace method is proposed for wall clutter mitigation. The radar signals received from the antenna array are transformed into a data tensor. Higher-order singular value decomposition is used to segregate the wall reflections from the target returns. Simulation and experimental results show that the proposed method is effective in removing reflections backscattered from both homogeneous and heterogeneous walls.
Dc-Link Fault Current Limiter-Based Fault Ride-Through Scheme For Inverter-Based Distributed Generation, Amin Jalilian, Mehrdad Tarafdar Hagh, Mehdi Abapour, Kashem M. Muttaqi
Dc-Link Fault Current Limiter-Based Fault Ride-Through Scheme For Inverter-Based Distributed Generation, Amin Jalilian, Mehrdad Tarafdar Hagh, Mehdi Abapour, Kashem M. Muttaqi
Faculty of Engineering and Information Sciences - Papers: Part A
Owing to increasing the penetration level of the inverter-based distributed generations (IBDGs) in power systems, their fault ride-through (FRT) capability has become one of the essential issues of new grid codes. This study proposes a novel DC-link fault current limiter (DLFCL)-based FRT scheme to improve the FRT capability in IBDG units. The DLFCL module has almost no effect on normal operation of IBDG. When a short-circuit fault occurs in power system, the DLFCL module effectively limits the inverter output current and protects its switching devices. The employed DLFCL does not need any control, measurement and gate driving system. Also, it …
Summary Of The Economic Impacts Of Power Quality On Consumers, Sean T. Elphick, Philip Ciufo, Victor W. Smith, Sarath Perera
Summary Of The Economic Impacts Of Power Quality On Consumers, Sean T. Elphick, Philip Ciufo, Victor W. Smith, Sarath Perera
Faculty of Engineering and Information Sciences - Papers: Part A
The quality of the electrical supply has a direct impact on the correct function and operation of equipment connected to the public electricity supply network. There is an expectation that devices will operate as designed and that equipment lifetime should, statistically, be close to the designed value. The reliability of the network is generally assumed to be high enough so as to not cause unacceptable issues with regard to loss of production or loss of functionality. Quantifying the cost to the consumer when the supply power quality or reliability are not as expected is an important metric and can be …
Direct Power Control Of Dfig Based Wind Turbine Based On Wind Speed Estimation And Particle Swarm Optimization, Mehrdad Tarafdar Hagh, S Roozbehani, F Najaty, S Ghaemi, Yingjie Tan, Kashem M. Muttaqi
Direct Power Control Of Dfig Based Wind Turbine Based On Wind Speed Estimation And Particle Swarm Optimization, Mehrdad Tarafdar Hagh, S Roozbehani, F Najaty, S Ghaemi, Yingjie Tan, Kashem M. Muttaqi
Faculty of Engineering and Information Sciences - Papers: Part A
This paper presents a direct power control (DPC) design of a grid connected doubly fed induction generator (DFIG) based wind turbine system in order to track maximum absorbable power in different wind speeds. A generalized regression neural network (GRNN) is used to estimate wind speed and thereby the maximum absorbable power is determined online as a function of wind speed. Finally the proposed DPC strategy employs a nonlinear robust sliding mode control (SMC) scheme to calculate the required rotor control voltage directly. The concept of sliding mode control is incorporated into particle swarm optimization (PSO) to determine inertial weights. The …
Radial Consolidation Response Upon The Application And Removal Of Vacuum And Fill Loading, Kourosh Kianfar, Buddhima Indraratna, Cholachat Rujikiatkamjorn, Serge Leroueil
Radial Consolidation Response Upon The Application And Removal Of Vacuum And Fill Loading, Kourosh Kianfar, Buddhima Indraratna, Cholachat Rujikiatkamjorn, Serge Leroueil
Faculty of Engineering and Information Sciences - Papers: Part A
This Note presents a laboratory study using a Rowe cell to compare the consolidation responses upon vacuum pressure and fill load application and removal. The influences of the duration of application and removal of fill load and vacuum pressures on radial consolidation were investigated using excess pore-water pressure, axial strain, and overconsolidation ratio. It is shown that the appropriate removal time for vacuum pressure can be determined based on excess pore pressure responses.
Mlaas: A Cloud System For Mobile Micro Learning In Mooc, Geng Sun, Tingru Cui, Shiping Chen, Wanwu Guo, Jun Shen
Mlaas: A Cloud System For Mobile Micro Learning In Mooc, Geng Sun, Tingru Cui, Shiping Chen, Wanwu Guo, Jun Shen
Faculty of Engineering and Information Sciences - Papers: Part A
No abstract provided.
Coal Seam Gas Produced Water Treatment By Ultrafiltration, Reverse Osmosis And Multi-Effect Distillation: A Pilot Study, Long D. Nghiem, Christian Elters, Alexander Simon, Taguchi Tatsuya, William Price
Coal Seam Gas Produced Water Treatment By Ultrafiltration, Reverse Osmosis And Multi-Effect Distillation: A Pilot Study, Long D. Nghiem, Christian Elters, Alexander Simon, Taguchi Tatsuya, William Price
Faculty of Engineering and Information Sciences - Papers: Part A
This study evaluates the technical feasibility of a pilot treatment train of ultrafiltration, reverse osmosis (RO), and multi-effect distillation (MED) for coal seam gas (CSG) produced water treatment. A total of 12,000 L of CSG produced water was processed from the Gloucester Basin in New South Wales (Australia). The results demonstrate the technical feasibility to obtain an overall clean water recovery of 95% and a final brine containing mostly sodium bicarbonate up to of 48 g/L. Stable operations of the pilot RO and MED systems at 76% and 80% recovery, respectively, were achieved. The results show that anti-scalant addition could …
A Survey And Study Of Planar Antennas For Pico-Satellites, Faisel Em M Tubbal, Raad Raad, Kwan-Wu Chin
A Survey And Study Of Planar Antennas For Pico-Satellites, Faisel Em M Tubbal, Raad Raad, Kwan-Wu Chin
Faculty of Engineering and Information Sciences - Papers: Part A
Works on pico-satellites have gained momentum recently, especially those that consider pico-satellites as part of a much larger constellation or swarm. This feature allows pico-satellites to provide high temporal resolution of observational data and redundancy. In particular, it reduces the need for satellite-to-ground communications and, hence, helps save energy and allows the execution of distributed processing algorithms on the satellites themselves. Consequently, satellite-to-satellite or cross-link communication is critical. To realize these advantages, the cross-link antenna employed on pico-satellites must meet many criteria, namely, small size, lightweight, low-power consumption, high gain, wide bandwidth, circular polarization, and beam steerability. To date, no …
Effect Of Mesh On Springback In 3d Finite Element Analysis Of Flexible Microrolling, Feijun Qu, Zhengyi Jiang, Haina Lu
Effect Of Mesh On Springback In 3d Finite Element Analysis Of Flexible Microrolling, Feijun Qu, Zhengyi Jiang, Haina Lu
Faculty of Engineering and Information Sciences - Papers: Part A
In flexible microrolling, springback in thickness direction is a critical indicator to determine the forming quality. Accurate prediction of springback is one of the significant aspects in the finite element analysis of flexible microrolling. Meshing is a step of great importance in finite element analysis of manufacturing process as it directly determines the accuracy of the FEA results as well as the requested computational time. This paper presents a numerical study on revealing the mesh effects on the accuracy of springback estimation utilising ABAQUS/Standard for modelling and analyses. Two types of meshes with six mesh sizes for each mesh type …
A Combined Experimental-Numerical Approach For Determining Mechanical Properties Of Aluminum Subjects To Nanoindentation, Mao Liu, Cheng Lu, A Kiet Tieu, Ching-Tun Peng, Charlie Kong
A Combined Experimental-Numerical Approach For Determining Mechanical Properties Of Aluminum Subjects To Nanoindentation, Mao Liu, Cheng Lu, A Kiet Tieu, Ching-Tun Peng, Charlie Kong
Faculty of Engineering and Information Sciences - Papers: Part A
A crystal plasticity finite element method (CPFEM) model has been developed to investigate the mechanical properties and micro-texture evolution of single-crystal aluminum induced by a sharp Berkovich indenter. The load-displacement curves, pile-up patterns and lattice rotation angles from simulation are consistent with the experimental results. The pile-up phenomenon and lattice rotation have been discussed based on the theory of crystal plasticity. In addition, a polycrystal tensile CPFEM model has been established to explore the relationship between indentation hardness and yield stress. The elastic constraint factor C is slightly larger than conventional value 3 due to the strain hardening.
Thin Film Lubrication Of Hexadecane Confined By Iron And Iron Oxide Surfaces: A Crucial Role Of Surface Structure, Thi Dinh Ta, A Kiet Tieu, Hongtao Zhu, Buyung Kosasih
Thin Film Lubrication Of Hexadecane Confined By Iron And Iron Oxide Surfaces: A Crucial Role Of Surface Structure, Thi Dinh Ta, A Kiet Tieu, Hongtao Zhu, Buyung Kosasih
Faculty of Engineering and Information Sciences - Papers: Part A
A comparative analysis of thin film lubrication of hexadecane between different iron and its oxide surfaces has been carried out using classical molecular dynamic simulation. An ab initio force-field, COMPASS, was applied for n-hexadecane using explicit atom model. An effective potential derived from density functional theory calculation was utilized for the interfacial interaction between hexadecane and the tribo-surfaces. A quantitative surface parameterization was introduced to investigate the influence of surface properties on the structure, rheological properties, and tribological performance of the lubricant. The results show that although the wall-fluid attraction of hexadecane on pure iron surfaces is significantly stronger than …
Novel Reversible And Switchable Electrolytes Based On Magneto-Rheology, Jie Ding, Gangrou Peng, Kewei Shu, Caiyun Wang, Tongfei Tian, Wenrong Yang, Yuanchao Zhang, Gordon G. Wallace, Weihua Li
Novel Reversible And Switchable Electrolytes Based On Magneto-Rheology, Jie Ding, Gangrou Peng, Kewei Shu, Caiyun Wang, Tongfei Tian, Wenrong Yang, Yuanchao Zhang, Gordon G. Wallace, Weihua Li
Faculty of Engineering and Information Sciences - Papers: Part A
Replacing organic liquid electrolytes with solid electrolytes has led to a new perspective on batteries, enabling high-energy battery chemistry with intrinsically safe cell designs. However, most solid/gel electrolytes are easily deformed; under extreme deformation, leakage and/or short-circuiting can occur. Here, we report a novel magneto-rheological electrolyte (MR electrolyte) that responds to changes in an external magnetic field; the electrolyte exhibits low viscosity in the absence of a magnetic field and increased viscosity or a solid-like phase in the presence of a magnetic field. This change from a liquid to solid does not significantly change the conductivity of the MR electrolyte. …
Strengthening Mechanisms In Thermomechanically Processed Nbti-Microalloyed Steel, Andrii Kostryzhev, Olexandra Marenych, Chris R. Killmore, Elena V. Pereloma
Strengthening Mechanisms In Thermomechanically Processed Nbti-Microalloyed Steel, Andrii Kostryzhev, Olexandra Marenych, Chris R. Killmore, Elena V. Pereloma
Faculty of Engineering and Information Sciences - Papers: Part A
The effect of deformation temperature on microstructure and mechanical properties was investigated for thermomechanically processed NbTi-microalloyed steel with ferrite-pearlite microstructure. With a decrease in the finish deformation temperature at 1348 K to 1098 K (1075 °C to 825 °C) temperature range, the ambient temperature yield stress did not vary significantly, work hardening rate decreased, ultimate tensile strength decreased, and elongation to failure increased. These variations in mechanical properties were correlated to the variations in microstructural parameters (such as ferrite grain size, solid solution concentrations, precipitate number density and dislocation density). Calculations based on the measured microstructural parameters suggested the grain …
V2o5/Mesoporous Carbon Composite As A Cathode Material For Lithium-Ion Batteries, Mohammad Ihsan, Qing Meng, Li Li, Dan Li, Hongqiang Wang, Kuok Hau Seng, Zhixin Chen, Shane J. Kennedy, Zaiping Guo, Hua-Kun Liu
V2o5/Mesoporous Carbon Composite As A Cathode Material For Lithium-Ion Batteries, Mohammad Ihsan, Qing Meng, Li Li, Dan Li, Hongqiang Wang, Kuok Hau Seng, Zhixin Chen, Shane J. Kennedy, Zaiping Guo, Hua-Kun Liu
Faculty of Engineering and Information Sciences - Papers: Part A
V2O5/mesoporous carbon composite has been prepared by an ultrasonically assisted method followed by a sintering process. The as-prepared V2O5/mesoporous carbon material containing 90 wt% V2O5 shows better electrochemical performance, with capacity of 163 mA h g-1 after 100 cycles at the current density of 500 mA g-1, as well as better charge/discharge rate capability for lithium storage than V2O5 nanoparticles. The improved electrochemical performance indicates that the V2O5/mesoporous carbon composite could be used as a promising cathode material for …
Information Technology And Open Innovation: A Strategic Alignment Perspective, Tingru Cui, Hua Ye, Hock Hai Teo, Jizhen Li
Information Technology And Open Innovation: A Strategic Alignment Perspective, Tingru Cui, Hua Ye, Hock Hai Teo, Jizhen Li
Faculty of Engineering and Information Sciences - Papers: Part A
Advances in information technology (IT) have enabled firms to increasingly rely on open innovation. Although researchers and practitioners are interested in this phenomenon, there is a lack of theoretically driven research on how IT impacts organizational open innovation performance. Drawing on the strategic IT alignment perspective and related literature, we proposed a model to explain the performance of organizational open innovation; i.e., the alignment between IT strategies and the openness of open innovation strategies results in different outcomes for open innovation. Through the analysis of data from 225 firms in China, we found that the alignment between IT flexibility and …
Functional Brain Network Classification With Compact Representation Of Sice Matrices, Jianjia Zhang, Luping Zhou, Lei Wang, Wanqing Li
Functional Brain Network Classification With Compact Representation Of Sice Matrices, Jianjia Zhang, Luping Zhou, Lei Wang, Wanqing Li
Faculty of Engineering and Information Sciences - Papers: Part A
Recently, sparse inverse covariance estimation (SICE) technique has been employed to model functional brain connectivity. The inverse covariance matrix (SICE matrix in short) estimated for each subject is used as a representation of brain connectivity to discriminate Alzheimers disease from normal controls. However, we observed that direct use of the SICE matrix does not necessarily give satisfying discrimination, due to its high dimensionality and the scarcity of training subjects. Looking into this problem, we argue that the intrinsic dimensionality of these SICE matrices shall be much lower, considering i) an SICE matrix resides on a Riemannian manifold of symmetric positive …
On Transformation Of Query Scheduling Strategies In Distributed And Heterogeneous Database Systems, Janusz R. Getta, - Handoko
On Transformation Of Query Scheduling Strategies In Distributed And Heterogeneous Database Systems, Janusz R. Getta, - Handoko
Faculty of Engineering and Information Sciences - Papers: Part A
This work considers a problem of optimal query processing in heterogeneous and distributed database systems. A global query sub- mitted at a local site is decomposed into a number of queries processed at the remote sites. The partial results returned by the queries are in- tegrated at a local site. The paper addresses a problem of an optimal scheduling of queries that minimizes time spend on data integration of the partial results into the final answer. A global data model defined in this work provides a unified view of the heterogeneous data structures located at the remote sites and a …
Drawing Micro Learning Into Mooc: Using Fragmented Pieces Of Time To Enable Effective Entire Course Learning Experiences, Geng Sun, Tingru Cui, Jianming Yong, Jun Shen, Shiping Chen
Drawing Micro Learning Into Mooc: Using Fragmented Pieces Of Time To Enable Effective Entire Course Learning Experiences, Geng Sun, Tingru Cui, Jianming Yong, Jun Shen, Shiping Chen
Faculty of Engineering and Information Sciences - Papers: Part A
Recently the massive open online course (MOOC) is an emerging trend that attracts many educators’ and researchers’ attentions. Based on our pilot study focusing on the development and operation of MOOC in Australia, we found MOOC is featured with mastery learning and blended learning, but it suffers from low completion rates. Brining micro learning into MOOC can be a feasible solution to improve current MOOC delivery and learning experience. We design a system which aims to provide adaptive micro learning contents as well as learning path identifications customized for each individual learner. To investigate how micro learning can impact learning …
Identity-Based Quotable Ring Signature, Kefeng Wang, Yi Mu, Willy Susilo
Identity-Based Quotable Ring Signature, Kefeng Wang, Yi Mu, Willy Susilo
Faculty of Engineering and Information Sciences - Papers: Part A
We present a new notion of identity-based quotable ring signature. This new cryptographic primitive can be used to derive new ring signatures on substrings of an original message from an original ring signature on the original message, which is generated by the actual signer included in the ring. No matter whether a ring signature is originally generated or is quoted from another valid ring signature, it will convince the verifier that it is generated by one of the ring members, without revealing any information about which ring member is the actual signer. The set of ring members could be arbitrarily …
An Efficient Variant Of Boneh-Gentry-Hamburg's Identity-Based Encryption Without Pairing, Ibrahim Elashry, Yi Mu, Willy Susilo
An Efficient Variant Of Boneh-Gentry-Hamburg's Identity-Based Encryption Without Pairing, Ibrahim Elashry, Yi Mu, Willy Susilo
Faculty of Engineering and Information Sciences - Papers: Part A
No abstract provided.